syzbot has bisected this bug to: commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Date: Sun Jul 2 23:07:02 2017 +0000 Linux 4.12 bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11a2b78ce00000 start commit: 17dec0a9 Merge branch 'userns-linus' of git://git.kernel.o.. git tree: net-next kernel config: https://syzkaller.appspot.com/x/.config?x=da08d02b86752ade dashboard link: https://syzkaller.appspot.com/bug?extid=7810ed2e0cb359580c17 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=130abb47800000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=150a15bb800000 Reported-by: syzbot+7810ed2e0cb359580c17@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 6f7da290413b ("Linux 4.12") For information about bisection process see: https://goo.gl/tpsmEJ#bisection